- New CMake based build system. Based in part on contribution from

Igor Okulist and Damien Buhl (Patch #14). Added support for running
tests and building with DLL on Windows.
- added missing JSON_API
- Visual Studio DLL: suppressed warning "C4251: <data member>: <type> 
needs to have dll-interface to be used by..." via pragma push/pop
in json-cpp headers.
- New header json/version.h now contains version number macros
(JSONCPP_VERSION_MAJOR, JSONCPP_VERSION_MINOR, JSONCPP_VERSION_PATCH
and JSONCPP_VERSION_HEXA). While this header is generated by CMake,
it is committed to ease build with alternate build system 
(CMake only update the file when it changes avoid issues with VCS).

src/lib_json/CMakeLists.txt

@@ -0,0 +1,43 @@
+OPTION(JSONCPP_LIB_BUILD_SHARED "Build jsoncpp_lib as a shared library." OFF)
+IF(JSONCPP_LIB_BUILD_SHARED)
+  SET(JSONCPP_LIB_TYPE SHARED)
+  ADD_DEFINITIONS( -DJSON_DLL_BUILD )
+ELSE(JSONCPP_LIB_BUILD_SHARED)
+  SET(JSONCPP_LIB_TYPE STATIC)
+ENDIF(JSONCPP_LIB_BUILD_SHARED)
+
+
+SET( JSONCPP_INCLUDE_DIR ../../include )
+
+SET( PUBLIC_HEADERS
+    ${JSONCPP_INCLUDE_DIR}/json/config.h
+    ${JSONCPP_INCLUDE_DIR}/json/forwards.h
+    ${JSONCPP_INCLUDE_DIR}/json/features.h
+    ${JSONCPP_INCLUDE_DIR}/json/value.h
+    ${JSONCPP_INCLUDE_DIR}/json/reader.h
+    ${JSONCPP_INCLUDE_DIR}/json/writer.h
+    ${JSONCPP_INCLUDE_DIR}/json/assertions.h
+    ${JSONCPP_INCLUDE_DIR}/json/version.h
+    )
+
+SOURCE_GROUP( "Public API" FILES ${PUBLIC_HEADERS} )
+
+ADD_LIBRARY( jsoncpp_lib ${JSONCPP_LIB_TYPE}
+             ${PUBLIC_HEADERS} 
+             json_tool.h
+             json_reader.cpp
+             json_batchallocator.h
+             json_valueiterator.inl
+             json_value.cpp
+             json_writer.cpp
+             version.h.in
+             )
+SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES OUTPUT_NAME jsoncpp )
+SET_TARGET_PROPERTIES( jsoncpp_lib PROPERTIES VERSION ${JSON_CPP_VERSION} SOVERSION ${JSON_CPP_VERSION} )
+
+# Install instructions for this target
+INSTALL( TARGETS jsoncpp_lib
+         RUNTIME DESTINATION bin
+         LIBRARY DESTINATION lib
+         ARCHIVE DESTINATION lib
+)

src/lib_json/version.h.in

@@ -0,0 +1,14 @@
+// DO NOT EDIT. This file is generated by CMake from  "version" 
+// and "version.h.in" files.
+// Run CMake configure step to update it.
+#ifndef JSON_VERSION_H_INCLUDED
+# define JSON_VERSION_H_INCLUDED
+
+# define JSONCPP_VERSION_STRING "@JSONCPP_VERSION@"
+# define JSONCPP_VERSION_MAJOR @JSONCPP_VERSION_MAJOR@
+# define JSONCPP_VERSION_MINOR @JSONCPP_VERSION_MINOR@
+# define JSONCPP_VERSION_PATCH @JSONCPP_VERSION_PATCH@
+# define JSONCPP_VERSION_QUALIFIER @JSONCPP_VERSION_QUALIFIER@
+# define JSONCPP_VERSION_HEXA ((JSONCPP_VERSION_MAJOR << 24) | (JSONCPP_VERSION_MINOR << 16) | (JSONCPP_VERSION_PATCH << 8))
+
+#endif // JSON_VERSION_H_INCLUDED